+36
−5
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sata_promise: SATA hotplug support, take 2
This patch enables hotplugging of SATA devices in the sata_promise driver. It's been tested successfully on both first- and second-generation Promise SATA chips: SATA150 TX2plus, SATAII150 TX2plus, SATAII150 TX4, SATA300 TX2plus, and SATA300 TX4. The only quirk I've seen is that hotplugging (insertion) on the first-generation SATA150 TX2plus requires a lengthier EH sequence than on the second-generation chips. On the second-generation chips a simple soft reset seems to suffice, but on the first-generation chip there's a "port is slow to respond" after the initial soft reset, after which libata issues a hard reset, and then the device is recognised. The hotplug checks are high up in the interrupt handling path, not deep down in error_intr as in ahci/sata_sil24. That's because the chip doesn't signal hotplug status changes in the per-port status register: instead a global register contains hotplug control and status flags for all ports. I considered following the ahci/sata_sil24 structure, but that would have required non-trivial changes to the interrupt handling path, so I chose to keep the hotplug changes simple and unobtrusive. Signed-off-by:Mikael Pettersson <mikpe@it.uu.se> -- This patch depends on the "sata_promise: cleanups" patch. Changes since the previous version (posted June 19): - Correct pdc_interrupt() to increment 'handled' also in the hotplug case. This prevents IRQ_NONE from being returned when an interrupt only has hotplug events to handle, which could confuse the kernel's IRQ machinery. - Added testing on the SATAII150 TX4. drivers/ata/sata_promise.c | 41 ++++++++++++++++++++++++++++++++++++----- 1 files changed, 36 insertions(+), 5 deletions(-) Signed-off-by: